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Preheat the oven to 375ºF.
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In a medium bowl ,combine flour, sugar, cocoa powder, baking powder, and salt.
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Chop the room temperature butter into small pieces and rub into the dry ingredients until the mixture resembles breadcrumbs.
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Mix in the chopped dark chocolate.
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In a small bowl, mix together the egg and vanilla.
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Pour the egg mixture into the chocolate mixture and mix until moistened.
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Press the dough into a ball (you'll have to get your hands dirty here if you haven't already).
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Wrap the ball of dough in plastic wrap and refrigerate for 30 minutes.
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Put the confectioners' sugar in a shallow bowl.
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Using a tablespoon, form balls of the refrigerated chocolate mixture.
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Roll the ball in the confectioners' sugar.
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Place the sugar covered ball on a parchment lined baking sheet.
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Repeat with the remaining chocolate mixture, rolling in confectioners' sugar before placing on baking sheet.
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Bake about 10 minutes leaving the cookies just a bit undercooked on the insides.
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Cool on the pan for a few minutes before finishing cooling on a cooling rack.
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These are fabulous served warm, and almost just as good eaten over the next 4 days (store in an airtight container).